/**
 * @author arodic / https://github.com/arodic
 */

THREE.TransformControls = function ( camera, domElement ) {

  THREE.Object3D.call( this );

  domElement = ( domElement !== undefined ) ? domElement : document;

  this.visible = false;

  var _gizmo = new THREE.TransformControlsGizmo();
  this.add( _gizmo );

  var _plane = new THREE.TransformControlsPlane();
  this.add( _plane );

  var scope = this;

  // Define properties with getters/setter
  // Setting the defined property will automatically trigger change event
  // Defined properties are passed down to gizmo and plane

  defineProperty( "camera", camera );
  defineProperty( "object", undefined );
  defineProperty( "enabled", true );
  defineProperty( "axis", null );
  defineProperty( "mode", "translate" );
  defineProperty( "translationSnap", null );
  defineProperty( "rotationSnap", null );
  defineProperty( "space", "world" );
  defineProperty( "size", 1 );
  defineProperty( "dragging", false );
  defineProperty( "showX", true );
  defineProperty( "showY", true );
  defineProperty( "showZ", true );

  var changeEvent = { type: "change" };
  var mouseDownEvent = { type: "mouseDown" };
  var mouseUpEvent = { type: "mouseUp", mode: scope.mode };
  var objectChangeEvent = { type: "objectChange" };

  // Reusable utility variables

  var ray = new THREE.Raycaster();

  var _tempVector = new THREE.Vector3();
  var _tempVector2 = new THREE.Vector3();
  var _tempQuaternion = new THREE.Quaternion();
  var _unit = {
    X: new THREE.Vector3( 1, 0, 0 ),
    Y: new THREE.Vector3( 0, 1, 0 ),
    Z: new THREE.Vector3( 0, 0, 1 )
  };
  var _identityQuaternion = new THREE.Quaternion();
  var _alignVector = new THREE.Vector3();

  var pointStart = new THREE.Vector3();
  var pointEnd = new THREE.Vector3();
  var rotationAxis = new THREE.Vector3();
  var rotationAngle = 0;

  var cameraPosition = new THREE.Vector3();
  var cameraQuaternion = new THREE.Quaternion();
  var cameraScale = new THREE.Vector3();

  var parentPosition = new THREE.Vector3();
  var parentQuaternion = new THREE.Quaternion();
  var parentScale = new THREE.Vector3();

  var worldPositionStart = new THREE.Vector3();
  var worldQuaternionStart = new THREE.Quaternion();
  var worldScaleStart = new THREE.Vector3();

  var worldPosition = new THREE.Vector3();
  var worldQuaternion = new THREE.Quaternion();
  var worldScale = new THREE.Vector3();

  var eye = new THREE.Vector3();

  var _positionStart = new THREE.Vector3();
  var _quaternionStart = new THREE.Quaternion();
  var _scaleStart = new THREE.Vector3();

  // TODO: remove properties unused in plane and gizmo

  defineProperty( "parentQuaternion", parentQuaternion );
  defineProperty( "worldPosition", worldPosition );
  defineProperty( "worldPositionStart", worldPositionStart );
  defineProperty( "worldQuaternion", worldQuaternion );
  defineProperty( "worldQuaternionStart", worldQuaternionStart );
  defineProperty( "cameraPosition", cameraPosition );
  defineProperty( "cameraQuaternion", cameraQuaternion );
  defineProperty( "pointStart", pointStart );
  defineProperty( "pointEnd", pointEnd );
  defineProperty( "rotationAxis", rotationAxis );
  defineProperty( "rotationAngle", rotationAngle );
  defineProperty( "eye", eye );

  {

    domElement.addEventListener( "mousedown", onPointerDown, false );
    domElement.addEventListener( "touchstart", onPointerDown, false );
    domElement.addEventListener( "mousemove", onPointerHover, false );
    domElement.addEventListener( "touchmove", onPointerHover, false );
    domElement.addEventListener( "touchmove", onPointerMove, false );
    document.addEventListener( "mouseup", onPointerUp, false );
    domElement.addEventListener( "touchend", onPointerUp, false );
    domElement.addEventListener( "touchcancel", onPointerUp, false );
    domElement.addEventListener( "touchleave", onPointerUp, false );
    domElement.addEventListener( "contextmenu", onContext, false );

  }

  this.dispose = function () {

    domElement.removeEventListener( "mousedown", onPointerDown );
    domElement.removeEventListener( "touchstart", onPointerDown );
    domElement.removeEventListener( "mousemove", onPointerHover );
    domElement.removeEventListener( "touchmove", onPointerHover );
    domElement.removeEventListener( "touchmove", onPointerMove );
    document.removeEventListener( "mouseup", onPointerUp );
    domElement.removeEventListener( "touchend", onPointerUp );
    domElement.removeEventListener( "touchcancel", onPointerUp );
    domElement.removeEventListener( "touchleave", onPointerUp );
    domElement.removeEventListener( "contextmenu", onContext );

  };

  // Set current object
  this.attach = function ( object ) {

    this.object = object;
    this.visible = true;

  };

  // Detatch from object
  this.detach = function () {

    this.object = undefined;
    this.visible = false;
    this.axis = null;

  };

  // Defined getter, setter and store for a property
  function defineProperty( propName, defaultValue ) {

    var propValue = defaultValue;

    Object.defineProperty( scope, propName, {

      get: function() {

        return propValue !== undefined ? propValue : defaultValue;

      },

      set: function( value ) {

        if ( propValue !== value ) {

          propValue = value;
          _plane[ propName ] = value;
          _gizmo[ propName ] = value;

          scope.dispatchEvent( { type: propName + "-changed", value: value } );
          scope.dispatchEvent( changeEvent );

        }

      }

    });

    scope[ propName ] = defaultValue;
    _plane[ propName ] = defaultValue;
    _gizmo[ propName ] = defaultValue;

  }

  // updateMatrixWorld  updates key transformation variables
  this.updateMatrixWorld = function () {

    if ( this.object !== undefined ) {

      this.object.updateMatrixWorld();
      this.object.parent.matrixWorld.decompose( parentPosition, parentQuaternion, parentScale );
      this.object.matrixWorld.decompose( worldPosition, worldQuaternion, worldScale );

    }

    this.camera.updateMatrixWorld();
    this.camera.matrixWorld.decompose( cameraPosition, cameraQuaternion, cameraScale );

    if ( this.camera instanceof THREE.PerspectiveCamera ) {

      eye.copy( cameraPosition ).sub( worldPosition ).normalize();

    } else if ( this.camera instanceof THREE.OrthographicCamera ) {

      eye.copy( cameraPosition ).normalize();

    }

    THREE.Object3D.prototype.updateMatrixWorld.call( this );

  };

  this.pointerHover = function( pointer ) {

    if ( this.object === undefined || this.dragging === true || ( pointer.button !== undefined && pointer.button !== 0 ) ) return;

    ray.setFromCamera( pointer, this.camera );

    var intersect = ray.intersectObjects( _gizmo.picker[ this.mode ].children, true )[ 0 ] || false;

    if ( intersect ) {

      this.axis = intersect.object.name;

    } else {

      this.axis = null;

    }

  };

  this.pointerDown = function( pointer ) {

    if ( this.object === undefined || this.dragging === true || ( pointer.button !== undefined && pointer.button !== 0 ) ) return;

    if ( ( pointer.button === 0 || pointer.button === undefined ) && this.axis !== null ) {

      ray.setFromCamera( pointer, this.camera );

      var planeIntersect = ray.intersectObjects( [ _plane ], true )[ 0 ] || false;

      if ( planeIntersect ) {

        var space = this.space;

        if ( this.mode === 'scale') {

          space = 'local';

        } else if ( this.axis === 'E' ||  this.axis === 'XYZE' ||  this.axis === 'XYZ' ) {

          space = 'world';

        }

        if ( space === 'local' && this.mode === 'rotate' ) {

          var snap = this.rotationSnap;

          if ( this.axis === 'X' && snap ) this.object.rotation.x = Math.round( this.object.rotation.x / snap ) * snap;
          if ( this.axis === 'Y' && snap ) this.object.rotation.y = Math.round( this.object.rotation.y / snap ) * snap;
          if ( this.axis === 'Z' && snap ) this.object.rotation.z = Math.round( this.object.rotation.z / snap ) * snap;

        }

        this.object.updateMatrixWorld();
        this.object.parent.updateMatrixWorld();

        _positionStart.copy( this.object.position );
        _quaternionStart.copy( this.object.quaternion );
        _scaleStart.copy( this.object.scale );

        this.object.matrixWorld.decompose( worldPositionStart, worldQuaternionStart, worldScaleStart );

        pointStart.copy( planeIntersect.point ).sub( worldPositionStart );

        if ( space === 'local' ) pointStart.applyQuaternion( worldQuaternionStart.clone().inverse() );

      }

      this.dragging = true;
      mouseDownEvent.mode = this.mode;
      this.dispatchEvent( mouseDownEvent );

    }

  };

  this.pointerMove = function( pointer ) {

    var axis = this.axis;
    var mode = this.mode;
    var object = this.object;
    var space = this.space;

    if ( mode === 'scale') {

      space = 'local';

    } else if ( axis === 'E' ||  axis === 'XYZE' ||  axis === 'XYZ' ) {

      space = 'world';

    }

    if ( object === undefined || axis === null || this.dragging === false || ( pointer.button !== undefined && pointer.button !== 0 ) ) return;

    ray.setFromCamera( pointer, this.camera );

    var planeIntersect = ray.intersectObjects( [ _plane ], true )[ 0 ] || false;

    if ( planeIntersect === false ) return;

    pointEnd.copy( planeIntersect.point ).sub( worldPositionStart );

    if ( space === 'local' ) pointEnd.applyQuaternion( worldQuaternionStart.clone().inverse() );

    if ( mode === 'translate' ) {

      if ( axis.search( 'X' ) === -1 ) {
        pointEnd.x = pointStart.x;
      }
      if ( axis.search( 'Y' ) === -1 ) {
        pointEnd.y = pointStart.y;
      }
      if ( axis.search( 'Z' ) === -1 ) {
        pointEnd.z = pointStart.z;
      }

      // Apply translate

      if ( space === 'local' ) {
        object.position.copy( pointEnd ).sub( pointStart ).applyQuaternion( _quaternionStart );
      } else {
        object.position.copy( pointEnd ).sub( pointStart );
      }

      object.position.add( _positionStart );

      // Apply translation snap

      if ( this.translationSnap ) {

        if ( space === 'local' ) {

          object.position.applyQuaternion(_tempQuaternion.copy( _quaternionStart ).inverse() );

          if ( axis.search( 'X' ) !== -1 ) {
            object.position.x = Math.round( object.position.x / this.translationSnap ) * this.translationSnap;
          }

          if ( axis.search( 'Y' ) !== -1 ) {
            object.position.y = Math.round( object.position.y / this.translationSnap ) * this.translationSnap;
          }

          if ( axis.search( 'Z' ) !== -1 ) {
            object.position.z = Math.round( object.position.z / this.translationSnap ) * this.translationSnap;
          }

          object.position.applyQuaternion( _quaternionStart );

        }

        if ( space === 'world' ) {

          if ( object.parent ) {
            object.position.add( _tempVector.setFromMatrixPosition( object.parent.matrixWorld ) );
          }

          if ( axis.search( 'X' ) !== -1 ) {
            object.position.x = Math.round( object.position.x / this.translationSnap ) * this.translationSnap;
          }

          if ( axis.search( 'Y' ) !== -1 ) {
            object.position.y = Math.round( object.position.y / this.translationSnap ) * this.translationSnap;
          }

          if ( axis.search( 'Z' ) !== -1 ) {
            object.position.z = Math.round( object.position.z / this.translationSnap ) * this.translationSnap;
          }

          if ( object.parent ) {
            object.position.sub( _tempVector.setFromMatrixPosition( object.parent.matrixWorld ) );
          }

        }

      }

    } else if ( mode === 'scale' ) {

      if ( axis.search( 'XYZ' ) !== -1 ) {

        var d = pointEnd.length() / pointStart.length();

        if ( pointEnd.dot( pointStart ) < 0 ) d *= -1;

        _tempVector.set( d, d, d );

      } else {

        _tempVector.copy( pointEnd ).divide( pointStart );

        if ( axis.search( 'X' ) === -1 ) {
          _tempVector.x = 1;
        }
        if ( axis.search( 'Y' ) === -1 ) {
          _tempVector.y = 1;
        }
        if ( axis.search( 'Z' ) === -1 ) {
          _tempVector.z = 1;
        }

      }

      // Apply scale

      object.scale.copy( _scaleStart ).multiply( _tempVector );

    } else if ( mode === 'rotate' ) {

      var ROTATION_SPEED = 20 / worldPosition.distanceTo( _tempVector.setFromMatrixPosition( this.camera.matrixWorld ) );

      var quaternion = this.space === "local" ? worldQuaternion : _identityQuaternion;

      var unit = _unit[ axis ];

      if ( axis === 'E' ) {

        _tempVector.copy( pointEnd ).cross( pointStart );
        rotationAxis.copy( eye );
        rotationAngle = pointEnd.angleTo( pointStart ) * ( _tempVector.dot( eye ) < 0 ? 1 : -1 );

      } else if ( axis === 'XYZE' ) {

        _tempVector.copy( pointEnd ).sub( pointStart ).cross( eye ).normalize();
        rotationAxis.copy( _tempVector );
        rotationAngle = pointEnd.sub( pointStart ).dot( _tempVector.cross( eye ) ) * ROTATION_SPEED;

      } else if ( axis === 'X' || axis === 'Y' || axis === 'Z' ) {

        _alignVector.copy( unit ).applyQuaternion( quaternion );

        rotationAxis.copy( unit );

        _tempVector = unit.clone();
        _tempVector2 = pointEnd.clone().sub( pointStart );
        if ( space === 'local' ) {
          _tempVector.applyQuaternion( quaternion );
          _tempVector2.applyQuaternion( worldQuaternionStart );
        }
        rotationAngle = _tempVector2.dot( _tempVector.cross( eye ).normalize() ) * ROTATION_SPEED;

      }

      // Apply rotation snap

      if ( this.rotationSnap ) rotationAngle = Math.round( rotationAngle / this.rotationSnap ) * this.rotationSnap;

      this.rotationAngle = rotationAngle;

      // Apply rotate

      if ( space === 'local' ) {

        object.quaternion.copy( _quaternionStart );
        object.quaternion.multiply( _tempQuaternion.setFromAxisAngle( rotationAxis, rotationAngle ) );

      } else {

        object.quaternion.copy( _tempQuaternion.setFromAxisAngle( rotationAxis, rotationAngle ) );
        object.quaternion.multiply( _quaternionStart );

      }

    }

    this.dispatchEvent( changeEvent );
    this.dispatchEvent( objectChangeEvent );

  };

  this.pointerUp = function( pointer ) {

    if ( pointer.button !== undefined && pointer.button !== 0 ) return;

    if ( this.dragging && ( this.axis !== null ) ) {

      mouseUpEvent.mode = this.mode;
      this.dispatchEvent( mouseUpEvent );

    }

    this.dragging = false;

    if ( pointer.button === undefined ) this.axis = null;

  };

  // normalize mouse / touch pointer and remap {x,y} to view space.

  function getPointer( event ) {

    var pointer = event.changedTouches ? event.changedTouches[ 0 ] : event;

    var rect = domElement.getBoundingClientRect();

    return {
      x: ( pointer.clientX - rect.left ) / rect.width * 2 - 1,
      y: - ( pointer.clientY - rect.top ) / rect.height * 2 + 1,
      button: event.button
    };

  }

  // mouse / touch event handlers

  function onContext( event ) {

    event.preventDefault();

  }

  function onPointerHover( event ) {

    if ( !scope.enabled ) return;

    scope.pointerHover( getPointer( event ) );

  }

  function onPointerDown( event ) {

    if ( !scope.enabled ) return;

    event.preventDefault();

    document.addEventListener( "mousemove", onPointerMove, false );

    scope.pointerHover( getPointer( event ) );
    scope.pointerDown( getPointer( event ) );

  }

  function onPointerMove( event ) {

    if ( !scope.enabled ) return;

    event.preventDefault();

    scope.pointerMove( getPointer( event ) );

  }

  function onPointerUp( event ) {

    if ( !scope.enabled ) return;

    event.preventDefault(); // Prevent MouseEvent on mobile

    document.removeEventListener( "mousemove", onPointerMove, false );

    scope.pointerUp( getPointer( event ) );

  }

  // TODO: depricate

  this.getMode = function () {

    return scope.mode;

  };

  this.setMode = function ( mode ) {

    scope.mode = mode;

  };

  this.setTranslationSnap = function ( translationSnap ) {

    scope.translationSnap = translationSnap;

  };

  this.setRotationSnap = function ( rotationSnap ) {

    scope.rotationSnap = rotationSnap;

  };

  this.setSize = function ( size ) {

    scope.size = size;

  };

  this.setSpace = function ( space ) {

    scope.space = space;

  };

  this.update = function () {

    console.warn( 'THREE.TransformControls: update function has been depricated.' );

  };

};

THREE.TransformControls.prototype = Object.assign( Object.create( THREE.Object3D.prototype ), {

  constructor: THREE.TransformControls,

  isTransformControls: true

} );


THREE.TransformControlsGizmo = function () {

  'use strict';

  THREE.Object3D.call( this );

  this.type = 'TransformControlsGizmo';

  // shared materials

  var gizmoMaterial = new THREE.MeshBasicMaterial({
    depthTest: false,
    depthWrite: false,
    transparent: true,
    side: THREE.DoubleSide,
    fog: false
  });

  var gizmoLineMaterial = new THREE.LineBasicMaterial({
    depthTest: false,
    depthWrite: false,
    transparent: true,
    linewidth: 1,
    fog: false
  });

  // Make unique material for each axis/color

  var matInvisible = gizmoMaterial.clone();
  matInvisible.opacity = 0.15;

  var matHelper = gizmoMaterial.clone();
  matHelper.opacity = 0.33;

  var matRed = gizmoMaterial.clone();
  matRed.color.set( 0xff0000 );

  var matGreen = gizmoMaterial.clone();
  matGreen.color.set( 0x00ff00 );

  var matBlue = gizmoMaterial.clone();
  matBlue.color.set( 0x0000ff );

  var matWhiteTransperent = gizmoMaterial.clone();
  matWhiteTransperent.opacity = 0.25;

  var matYellowTransparent = matWhiteTransperent.clone();
  matYellowTransparent.color.set( 0xffff00 );

  var matCyanTransparent = matWhiteTransperent.clone();
  matCyanTransparent.color.set( 0x00ffff );

  var matMagentaTransparent = matWhiteTransperent.clone();
  matMagentaTransparent.color.set( 0xff00ff );

  var matYellow = gizmoMaterial.clone();
  matYellow.color.set( 0xffff00 );

  var matLineRed = gizmoLineMaterial.clone();
  matLineRed.color.set( 0xff0000 );

  var matLineGreen = gizmoLineMaterial.clone();
  matLineGreen.color.set( 0x00ff00 );

  var matLineBlue = gizmoLineMaterial.clone();
  matLineBlue.color.set( 0x0000ff );

  var matLineCyan = gizmoLineMaterial.clone();
  matLineCyan.color.set( 0x00ffff );

  var matLineMagenta = gizmoLineMaterial.clone();
  matLineMagenta.color.set( 0xff00ff );

  var matLineYellow = gizmoLineMaterial.clone();
  matLineYellow.color.set( 0xffff00 );

  var matLineGray = gizmoLineMaterial.clone();
  matLineGray.color.set( 0x787878);

  var matLineYellowTransparent = matLineYellow.clone();
  matLineYellowTransparent.opacity = 0.25;

  // reusable geometry

  var arrowGeometry = new THREE.CylinderBufferGeometry( 0, 0.05, 0.2, 12, 1, false);

  var scaleHandleGeometry = new THREE.BoxBufferGeometry( 0.125, 0.125, 0.125);

  var lineGeometry = new THREE.BufferGeometry( );
  lineGeometry.addAttribute('position', new THREE.Float32BufferAttribute( [ 0, 0, 0,	1, 0, 0 ], 3 ) );

  var CircleGeometry = function( radius, arc ) {

    var geometry = new THREE.BufferGeometry( );
    var vertices = [];

    for ( var i = 0; i <= 64 * arc; ++i ) {

      vertices.push( 0, Math.cos( i / 32 * Math.PI ) * radius, Math.sin( i / 32 * Math.PI ) * radius );

    }

    geometry.addAttribute('position', new THREE.Float32BufferAttribute( vertices, 3 ) );

    return geometry;

  };

  // Special geometry for transform helper. If scaled with position vector it spans from [0,0,0] to position

  var TranslateHelperGeometry = function( radius, arc ) {

    var geometry = new THREE.BufferGeometry()

    geometry.addAttribute('position', new THREE.Float32BufferAttribute( [ 0, 0, 0, 1, 1, 1 ], 3 ) );

    return geometry;

  };

  // Gizmo definitions - custom hierarchy definitions for setupGizmo() function

  var gizmoTranslate = {
    X: [
      [ new THREE.Mesh( arrowGeometry, matRed ), [ 1, 0, 0 ], [ 0, 0, -Math.PI / 2 ], null, 'fwd' ],
      [ new THREE.Mesh( arrowGeometry, matRed ), [ 1, 0, 0 ], [ 0, 0, Math.PI / 2 ], null, 'bwd' ],
      [ new THREE.Line( lineGeometry, matLineRed ) ]
    ],
    Y: [
      [ new THREE.Mesh( arrowGeometry, matGreen ), [ 0, 1, 0 ], null, null, 'fwd' ],
      [ new THREE.Mesh( arrowGeometry, matGreen ), [ 0, 1, 0 ], [ Math.PI, 0, 0 ], null, 'bwd' ],
      [ new THREE.Line( lineGeometry, matLineGreen ), null, [ 0, 0, Math.PI / 2 ] ]
    ],
    Z: [
      [ new THREE.Mesh( arrowGeometry, matBlue ), [ 0, 0, 1 ], [ Math.PI / 2, 0, 0 ], null, 'fwd' ],
      [ new THREE.Mesh( arrowGeometry, matBlue ), [ 0, 0, 1 ], [ -Math.PI / 2, 0, 0 ], null, 'bwd' ],
      [ new THREE.Line( lineGeometry, matLineBlue ), null, [ 0, -Math.PI / 2, 0 ] ]
    ],
    XYZ: [
      [ new THREE.Mesh( new THREE.OctahedronBufferGeometry( 0.1, 0 ), matWhiteTransperent ), [ 0, 0, 0 ], [ 0, 0, 0 ] ]
    ],
    XY: [
      [ new THREE.Mesh( new THREE.PlaneBufferGeometry( 0.295, 0.295 ), matYellowTransparent ), [ 0.15, 0.15, 0 ] ],
      [ new THREE.Line( lineGeometry, matLineYellow ), [ 0.18, 0.3, 0 ], null, [ 0.125, 1, 1 ] ],
      [ new THREE.Line( lineGeometry, matLineYellow ), [ 0.3, 0.18, 0 ], [ 0, 0, Math.PI / 2 ], [ 0.125, 1, 1 ] ]
    ],
    YZ: [
      [ new THREE.Mesh( new THREE.PlaneBufferGeometry( 0.295, 0.295 ), matCyanTransparent ), [ 0, 0.15, 0.15 ], [ 0, Math.PI / 2, 0 ] ],
      [ new THREE.Line( lineGeometry, matLineCyan ), [ 0, 0.18, 0.3 ], [ 0, 0, Math.PI / 2 ], [ 0.125, 1, 1 ] ],
      [ new THREE.Line( lineGeometry, matLineCyan ), [ 0, 0.3, 0.18 ], [ 0, -Math.PI / 2, 0 ], [ 0.125, 1, 1 ] ]
    ],
    XZ: [
      [ new THREE.Mesh( new THREE.PlaneBufferGeometry( 0.295, 0.295 ), matMagentaTransparent ), [ 0.15, 0, 0.15 ], [ -Math.PI / 2, 0, 0 ] ],
      [ new THREE.Line( lineGeometry, matLineMagenta ), [ 0.18, 0, 0.3 ], null, [ 0.125, 1, 1 ] ],
      [ new THREE.Line( lineGeometry, matLineMagenta ), [ 0.3, 0, 0.18 ], [ 0, -Math.PI / 2, 0 ], [ 0.125, 1, 1 ] ]
    ]
  };

  var pickerTranslate = {
    X: [
      [ new THREE.Mesh( new THREE.CylinderBufferGeometry( 0.2, 0, 1, 4, 1, false ), matInvisible ), [ 0.6, 0, 0 ], [ 0, 0, -Math.PI / 2 ] ]
    ],
    Y: [
      [ new THREE.Mesh( new THREE.CylinderBufferGeometry( 0.2, 0, 1, 4, 1, false ), matInvisible ), [ 0, 0.6, 0 ] ]
    ],
    Z: [
      [ new THREE.Mesh( new THREE.CylinderBufferGeometry( 0.2, 0, 1, 4, 1, false ), matInvisible ), [ 0, 0, 0.6 ], [ Math.PI / 2, 0, 0 ] ]
    ],
    XYZ: [
      [ new THREE.Mesh( new THREE.OctahedronBufferGeometry( 0.2, 0 ), matInvisible ) ]
    ],
    XY: [
      [ new THREE.Mesh( new THREE.PlaneBufferGeometry( 0.4, 0.4 ), matInvisible ), [ 0.2, 0.2, 0 ] ]
    ],
    YZ: [
      [ new THREE.Mesh( new THREE.PlaneBufferGeometry( 0.4, 0.4 ), matInvisible ), [ 0, 0.2, 0.2 ], [ 0, Math.PI / 2, 0 ] ]
    ],
    XZ: [
      [ new THREE.Mesh( new THREE.PlaneBufferGeometry( 0.4, 0.4 ), matInvisible ), [ 0.2, 0, 0.2 ], [ -Math.PI / 2, 0, 0 ] ]
    ]
  };

  var helperTranslate = {
    START: [
      [ new THREE.Mesh( new THREE.OctahedronBufferGeometry( 0.01, 2 ), matHelper ), null, null, null, 'helper' ]
    ],
    END: [
      [ new THREE.Mesh( new THREE.OctahedronBufferGeometry( 0.01, 2 ), matHelper ), null, null, null, 'helper' ]
    ],
    DELTA: [
      [ new THREE.Line( TranslateHelperGeometry(), matHelper ), null, null, null, 'helper' ]
    ],
    X: [
      [ new THREE.Line( lineGeometry, matHelper.clone() ), [ -1e3, 0, 0 ], null, [ 1e6, 1, 1 ], 'helper' ]
    ],
    Y: [
      [ new THREE.Line( lineGeometry, matHelper.clone() ), [ 0, -1e3, 0 ], [ 0, 0, Math.PI / 2 ], [ 1e6, 1, 1 ], 'helper' ]
    ],
    Z: [
      [ new THREE.Line( lineGeometry, matHelper.clone() ), [ 0, 0, -1e3 ], [ 0, -Math.PI / 2, 0 ], [ 1e6, 1, 1 ], 'helper' ]
    ]
  };

  var gizmoRotate = {
    X: [
      [ new THREE.Line( CircleGeometry( 1, 0.5 ), matLineRed ) ],
      [ new THREE.Mesh( new THREE.OctahedronBufferGeometry( 0.04, 0 ), matRed ), [ 0, 0, 0.99 ], null, [ 1, 3, 1 ] ],
    ],
    Y: [
      [ new THREE.Line( CircleGeometry( 1, 0.5 ), matLineGreen ), null, [ 0, 0, -Math.PI / 2 ] ],
      [ new THREE.Mesh( new THREE.OctahedronBufferGeometry( 0.04, 0 ), matGreen ), [ 0, 0, 0.99 ], null, [ 3, 1, 1 ] ],
    ],
    Z: [
      [ new THREE.Line( CircleGeometry( 1, 0.5 ), matLineBlue ), null, [ 0, Math.PI / 2, 0 ] ],
      [ new THREE.Mesh( new THREE.OctahedronBufferGeometry( 0.04, 0 ), matBlue ), [ 0.99, 0, 0 ], null, [ 1, 3, 1 ] ],
    ],
    E: [
      [ new THREE.Line( CircleGeometry( 1.25, 1 ), matLineYellowTransparent ), null, [ 0, Math.PI / 2, 0 ] ],
      [ new THREE.Mesh( new THREE.CylinderBufferGeometry( 0.03, 0, 0.15, 4, 1, false ), matLineYellowTransparent ), [ 1.17, 0, 0 ], [ 0, 0, -Math.PI / 2 ], [ 1, 1, 0.001 ]],
      [ new THREE.Mesh( new THREE.CylinderBufferGeometry( 0.03, 0, 0.15, 4, 1, false ), matLineYellowTransparent ), [ -1.17, 0, 0 ], [ 0, 0, Math.PI / 2 ], [ 1, 1, 0.001 ]],
      [ new THREE.Mesh( new THREE.CylinderBufferGeometry( 0.03, 0, 0.15, 4, 1, false ), matLineYellowTransparent ), [ 0, -1.17, 0 ], [ Math.PI, 0, 0 ], [ 1, 1, 0.001 ]],
      [ new THREE.Mesh( new THREE.CylinderBufferGeometry( 0.03, 0, 0.15, 4, 1, false ), matLineYellowTransparent ), [ 0, 1.17, 0 ], [ 0, 0, 0 ], [ 1, 1, 0.001 ]],
    ],
    XYZE: [
      [ new THREE.Line( CircleGeometry( 1, 1 ), matLineGray ), null, [ 0, Math.PI / 2, 0 ] ]
    ]
  };

  var helperRotate = {
    AXIS: [
      [ new THREE.Line( lineGeometry, matHelper.clone() ), [ -1e3, 0, 0 ], null, [ 1e6, 1, 1 ], 'helper' ]
    ]
  };

  var pickerRotate = {
    X: [
      [ new THREE.Mesh( new THREE.TorusBufferGeometry( 1, 0.1, 4, 24 ), matInvisible ), [ 0, 0, 0 ], [ 0, -Math.PI / 2, -Math.PI / 2 ] ],
    ],
    Y: [
      [ new THREE.Mesh( new THREE.TorusBufferGeometry( 1, 0.1, 4, 24 ), matInvisible ), [ 0, 0, 0 ], [ Math.PI / 2, 0, 0 ] ],
    ],
    Z: [
      [ new THREE.Mesh( new THREE.TorusBufferGeometry( 1, 0.1, 4, 24 ), matInvisible ), [ 0, 0, 0 ], [ 0, 0, -Math.PI / 2 ] ],
    ],
    E: [
      [ new THREE.Mesh( new THREE.TorusBufferGeometry( 1.25, 0.1, 2, 24 ), matInvisible ) ]
    ],
    XYZE: [
      [ new THREE.Mesh( new THREE.SphereBufferGeometry( 0.7, 10, 8 ), matInvisible ) ]
    ]
  };

  var gizmoScale = {
    X: [
      [ new THREE.Mesh( scaleHandleGeometry, matRed ), [ 0.8, 0, 0 ], [ 0, 0, -Math.PI / 2 ] ],
      [ new THREE.Line( lineGeometry, matLineRed ), null, null, [ 0.8, 1, 1 ] ]
    ],
    Y: [
      [ new THREE.Mesh( scaleHandleGeometry, matGreen ), [ 0, 0.8, 0 ] ],
      [ new THREE.Line( lineGeometry, matLineGreen ), null, [ 0, 0, Math.PI / 2 ], [ 0.8, 1, 1 ] ]
    ],
    Z: [
      [ new THREE.Mesh( scaleHandleGeometry, matBlue ), [ 0, 0, 0.8 ], [ Math.PI / 2, 0, 0 ] ],
      [ new THREE.Line( lineGeometry, matLineBlue ), null, [ 0, -Math.PI / 2, 0 ], [ 0.8, 1, 1 ] ]
    ],
    XY: [
      [ new THREE.Mesh( scaleHandleGeometry, matYellowTransparent ), [ 0.85, 0.85, 0 ], null, [ 2, 2, 0.2 ] ],
      [ new THREE.Line( lineGeometry, matLineYellow ), [ 0.855, 0.98, 0 ], null, [ 0.125, 1, 1 ] ],
      [ new THREE.Line( lineGeometry, matLineYellow ), [ 0.98, 0.855, 0 ], [ 0, 0, Math.PI / 2 ], [ 0.125, 1, 1 ] ]
    ],
    YZ: [
      [ new THREE.Mesh( scaleHandleGeometry, matCyanTransparent ), [ 0, 0.85, 0.85 ], null, [ 0.2, 2, 2 ] ],
      [ new THREE.Line( lineGeometry, matLineCyan ), [ 0, 0.855, 0.98 ], [ 0, 0, Math.PI / 2 ], [ 0.125, 1, 1 ] ],
      [ new THREE.Line( lineGeometry, matLineCyan ), [ 0, 0.98, 0.855 ], [ 0, -Math.PI / 2, 0 ], [ 0.125, 1, 1 ] ]
    ],
    XZ: [
      [ new THREE.Mesh( scaleHandleGeometry, matMagentaTransparent ), [ 0.85, 0, 0.85 ], null, [ 2, 0.2, 2 ] ],
      [ new THREE.Line( lineGeometry, matLineMagenta ), [ 0.855, 0, 0.98 ], null, [ 0.125, 1, 1 ] ],
      [ new THREE.Line( lineGeometry, matLineMagenta ), [ 0.98, 0, 0.855 ], [ 0, -Math.PI / 2, 0 ], [ 0.125, 1, 1 ] ]
    ],
    XYZX: [
      [ new THREE.Mesh( new THREE.BoxBufferGeometry( 0.125, 0.125, 0.125 ), matWhiteTransperent ), [ 1.1, 0, 0 ] ],
    ],
    XYZY: [
      [ new THREE.Mesh( new THREE.BoxBufferGeometry( 0.125, 0.125, 0.125 ), matWhiteTransperent ), [ 0, 1.1, 0 ] ],
    ],
    XYZZ: [
      [ new THREE.Mesh( new THREE.BoxBufferGeometry( 0.125, 0.125, 0.125 ), matWhiteTransperent ), [ 0, 0, 1.1 ] ],
    ]
  };

  var pickerScale = {
    X: [
      [ new THREE.Mesh( new THREE.CylinderBufferGeometry( 0.2, 0, 0.8, 4, 1, false ), matInvisible ), [ 0.5, 0, 0 ], [ 0, 0, -Math.PI / 2 ] ]
    ],
    Y: [
      [ new THREE.Mesh( new THREE.CylinderBufferGeometry( 0.2, 0, 0.8, 4, 1, false ), matInvisible ), [ 0, 0.5, 0 ] ]
    ],
    Z: [
      [ new THREE.Mesh( new THREE.CylinderBufferGeometry( 0.2, 0, 0.8, 4, 1, false ), matInvisible ), [ 0, 0, 0.5 ], [ Math.PI / 2, 0, 0 ] ]
    ],
    XY: [
      [ new THREE.Mesh( scaleHandleGeometry, matInvisible ), [ 0.85, 0.85, 0 ], null, [ 3, 3, 0.2 ] ],
    ],
    YZ: [
      [ new THREE.Mesh( scaleHandleGeometry, matInvisible ), [ 0, 0.85, 0.85 ], null, [ 0.2, 3, 3 ] ],
    ],
    XZ: [
      [ new THREE.Mesh( scaleHandleGeometry, matInvisible ), [ 0.85, 0, 0.85 ], null, [ 3, 0.2, 3 ] ],
    ],
    XYZX: [
      [ new THREE.Mesh( new THREE.BoxBufferGeometry( 0.2, 0.2, 0.2 ), matInvisible ), [ 1.1, 0, 0 ] ],
    ],
    XYZY: [
      [ new THREE.Mesh( new THREE.BoxBufferGeometry( 0.2, 0.2, 0.2 ), matInvisible ), [ 0, 1.1, 0 ] ],
    ],
    XYZZ: [
      [ new THREE.Mesh( new THREE.BoxBufferGeometry( 0.2, 0.2, 0.2 ), matInvisible ), [ 0, 0, 1.1 ] ],
    ]
  };

  var helperScale = {
    X: [
      [ new THREE.Line( lineGeometry, matHelper.clone() ), [ -1e3, 0, 0 ], null, [ 1e6, 1, 1 ], 'helper' ]
    ],
    Y: [
      [ new THREE.Line( lineGeometry, matHelper.clone() ), [ 0, -1e3, 0 ], [ 0, 0, Math.PI / 2 ], [ 1e6, 1, 1 ], 'helper' ]
    ],
    Z: [
      [ new THREE.Line( lineGeometry, matHelper.clone() ), [ 0, 0, -1e3 ], [ 0, -Math.PI / 2, 0 ], [ 1e6, 1, 1 ], 'helper' ]
    ]
  };

  // Creates an Object3D with gizmos described in custom hierarchy definition.

  var setupGizmo = function( gizmoMap ) {

    var gizmo = new THREE.Object3D();

    for ( var name in gizmoMap ) {

      for ( var i = gizmoMap[ name ].length; i --; ) {

        var object = gizmoMap[ name ][ i ][ 0 ].clone();
        var position = gizmoMap[ name ][ i ][ 1 ];
        var rotation = gizmoMap[ name ][ i ][ 2 ];
        var scale = gizmoMap[ name ][ i ][ 3 ];
        var tag = gizmoMap[ name ][ i ][ 4 ];

        // name and tag properties are essential for picking and updating logic.
        object.name = name;
        object.tag = tag;

        if (position) {
          object.position.set(position[ 0 ], position[ 1 ], position[ 2 ]);
        }
        if (rotation) {
          object.rotation.set(rotation[ 0 ], rotation[ 1 ], rotation[ 2 ]);
        }
        if (scale) {
          object.scale.set(scale[ 0 ], scale[ 1 ], scale[ 2 ]);
        }

        object.updateMatrix();

        var tempGeometry = object.geometry.clone();
        tempGeometry.applyMatrix(object.matrix);
        object.geometry = tempGeometry;

        object.position.set( 0, 0, 0 );
        object.rotation.set( 0, 0, 0 );
        object.scale.set(1, 1, 1);

        gizmo.add(object);

      }

    }

    return gizmo;

  };

  // Reusable utility variables

  var tempVector = new THREE.Vector3( 0, 0, 0 );
  var tempEuler = new THREE.Euler();
  var alignVector = new THREE.Vector3( 0, 1, 0 );
  var zeroVector = new THREE.Vector3( 0, 0, 0 );
  var lookAtMatrix = new THREE.Matrix4();
  var tempQuaternion = new THREE.Quaternion();
  var tempQuaternion2 = new THREE.Quaternion();
  var identityQuaternion = new THREE.Quaternion();

  var unitX = new THREE.Vector3( 1, 0, 0 );
  var unitY = new THREE.Vector3( 0, 1, 0 );
  var unitZ = new THREE.Vector3( 0, 0, 1 );

  // Gizmo creation

  this.gizmo = {};
  this.picker = {};
  this.helper = {};

  this.add( this.gizmo[ "translate" ] = setupGizmo( gizmoTranslate ) );
  this.add( this.gizmo[ "rotate" ] = setupGizmo( gizmoRotate ) );
  this.add( this.gizmo[ "scale" ] = setupGizmo( gizmoScale ) );
  this.add( this.picker[ "translate" ] = setupGizmo( pickerTranslate ) );
  this.add( this.picker[ "rotate" ] = setupGizmo( pickerRotate ) );
  this.add( this.picker[ "scale" ] = setupGizmo( pickerScale ) );
  this.add( this.helper[ "translate" ] = setupGizmo( helperTranslate ) );
  this.add( this.helper[ "rotate" ] = setupGizmo( helperRotate ) );
  this.add( this.helper[ "scale" ] = setupGizmo( helperScale ) );

  // Pickers should be hidden always

  this.picker[ "translate" ].visible = false;
  this.picker[ "rotate" ].visible = false;
  this.picker[ "scale" ].visible = false;

  // updateMatrixWorld will update transformations and appearance of individual handles

  this.updateMatrixWorld = function () {

    var space = this.space;

    if ( this.mode === 'scale' ) space = 'local'; // scale always oriented to local rotation

    var quaternion = space === "local" ? this.worldQuaternion : identityQuaternion;

    // Show only gizmos for current transform mode

    this.gizmo[ "translate" ].visible = this.mode === "translate";
    this.gizmo[ "rotate" ].visible = this.mode === "rotate";
    this.gizmo[ "scale" ].visible = this.mode === "scale";

    this.helper[ "translate" ].visible = this.mode === "translate";
    this.helper[ "rotate" ].visible = this.mode === "rotate";
    this.helper[ "scale" ].visible = this.mode === "scale";


    var handles = [];
    handles = handles.concat( this.picker[ this.mode ].children );
    handles = handles.concat( this.gizmo[ this.mode ].children );
    handles = handles.concat( this.helper[ this.mode ].children );

    for ( var i = 0; i < handles.length; i++ ) {

      var handle = handles[i];

      // hide aligned to camera

      handle.visible = true;
      handle.rotation.set( 0, 0, 0 );
      handle.position.copy( this.worldPosition );

      var eyeDistance = this.worldPosition.distanceTo( this.cameraPosition);
      handle.scale.set( 1, 1, 1 ).multiplyScalar( eyeDistance * this.size / 7 );

      // TODO: simplify helpers and consider decoupling from gizmo

      if ( handle.tag === 'helper' ) {

        handle.visible = false;

        if ( handle.name === 'AXIS' ) {

          handle.position.copy( this.worldPositionStart );
          handle.visible = !!this.axis;

          if ( this.axis === 'X' ) {

            tempQuaternion.setFromEuler( tempEuler.set( 0, 0, 0 ) );
            handle.quaternion.copy( quaternion ).multiply( tempQuaternion );

            if ( Math.abs( alignVector.copy( unitX ).applyQuaternion( quaternion ).dot( this.eye ) ) > 0.9 ) {
              handle.visible = false;
            }

          }

          if ( this.axis === 'Y' ) {

            tempQuaternion.setFromEuler( tempEuler.set( 0, 0, Math.PI / 2 ) );
            handle.quaternion.copy( quaternion ).multiply( tempQuaternion );

            if ( Math.abs( alignVector.copy( unitY ).applyQuaternion( quaternion ).dot( this.eye ) ) > 0.9 ) {
              handle.visible = false;
            }

          }

          if ( this.axis === 'Z' ) {

            tempQuaternion.setFromEuler( tempEuler.set( 0, Math.PI / 2, 0 ) );
            handle.quaternion.copy( quaternion ).multiply( tempQuaternion );

            if ( Math.abs( alignVector.copy( unitZ ).applyQuaternion( quaternion ).dot( this.eye ) ) > 0.9 ) {
              handle.visible = false;
            }

          }

          if ( this.axis === 'XYZE' ) {

            tempQuaternion.setFromEuler( tempEuler.set( 0, Math.PI / 2, 0 ) );
            alignVector.copy( this.rotationAxis );
            handle.quaternion.setFromRotationMatrix( lookAtMatrix.lookAt( zeroVector, alignVector, unitY ) );
            handle.quaternion.multiply( tempQuaternion );
            handle.visible = this.dragging;

          }

          if ( this.axis === 'E' ) {

            handle.visible = false;

          }


        } else if ( handle.name === 'START' ) {

          handle.position.copy( this.worldPositionStart );
          handle.visible = this.dragging;

        } else if ( handle.name === 'END' ) {

          handle.position.copy( this.worldPosition );
          handle.visible = this.dragging;

        } else if ( handle.name === 'DELTA' ) {

          handle.position.copy( this.worldPositionStart );
          handle.quaternion.copy( this.worldQuaternionStart );
          tempVector.set( 1e-10, 1e-10, 1e-10 ).add( this.worldPositionStart ).sub( this.worldPosition ).multiplyScalar( -1 );
          tempVector.applyQuaternion( this.worldQuaternionStart.clone().inverse() );
          handle.scale.copy( tempVector );
          handle.visible = this.dragging;

        } else {

          handle.quaternion.copy( quaternion );

          if ( this.dragging ) {

            handle.position.copy( this.worldPositionStart );

          } else {

            handle.position.copy( this.worldPosition );

          }

          if ( this.axis ) {

            handle.visible = this.axis.search( handle.name ) !== -1;

          }

        }

        // If updating helper, skip rest of the loop
        continue;

      }

      // Align handles to current local or world rotation

      handle.quaternion.copy( quaternion );

      if ( this.mode === 'translate' || this.mode === 'scale' ) {

        // Hide translate and scale axis facing the camera

        var AXIS_HIDE_TRESHOLD = 0.99;
        var PLANE_HIDE_TRESHOLD = 0.2;
        var AXIS_FLIP_TRESHOLD = -0.4;


        if ( handle.name === 'X' || handle.name === 'XYZX' ) {
          if ( Math.abs( alignVector.copy( unitX ).applyQuaternion( quaternion ).dot( this.eye ) ) > AXIS_HIDE_TRESHOLD ) {
            handle.scale.set( 1e-10, 1e-10, 1e-10 );
            handle.visible = false;
          }
        }
        if ( handle.name === 'Y' || handle.name === 'XYZY' ) {
          if ( Math.abs( alignVector.copy( unitY ).applyQuaternion( quaternion ).dot( this.eye ) ) > AXIS_HIDE_TRESHOLD ) {
            handle.scale.set( 1e-10, 1e-10, 1e-10 );
            handle.visible = false;
          }
        }
        if ( handle.name === 'Z' || handle.name === 'XYZZ' ) {
          if ( Math.abs( alignVector.copy( unitZ ).applyQuaternion( quaternion ).dot( this.eye ) ) > AXIS_HIDE_TRESHOLD ) {
            handle.scale.set( 1e-10, 1e-10, 1e-10 );
            handle.visible = false;
          }
        }
        if ( handle.name === 'XY' ) {
          if ( Math.abs( alignVector.copy( unitZ ).applyQuaternion( quaternion ).dot( this.eye ) ) < PLANE_HIDE_TRESHOLD ) {
            handle.scale.set( 1e-10, 1e-10, 1e-10 );
            handle.visible = false;
          }
        }
        if ( handle.name === 'YZ' ) {
          if ( Math.abs( alignVector.copy( unitX ).applyQuaternion( quaternion ).dot( this.eye ) ) < PLANE_HIDE_TRESHOLD ) {
            handle.scale.set( 1e-10, 1e-10, 1e-10 );
            handle.visible = false;
          }
        }
        if ( handle.name === 'XZ' ) {
          if ( Math.abs( alignVector.copy( unitY ).applyQuaternion( quaternion ).dot( this.eye ) ) < PLANE_HIDE_TRESHOLD ) {
            handle.scale.set( 1e-10, 1e-10, 1e-10 );
            handle.visible = false;
          }
        }

        // Flip translate and scale axis ocluded behind another axis

        if ( handle.name.search( 'X' ) !== -1 ) {
          if ( alignVector.copy( unitX ).applyQuaternion( quaternion ).dot( this.eye ) < AXIS_FLIP_TRESHOLD ) {
            if ( handle.tag === 'fwd' ) {
              handle.visible = false;
            } else {
              handle.scale.x *= -1;
            }
          } else if ( handle.tag === 'bwd' ) {
            handle.visible = false;
          }
        }

        if ( handle.name.search( 'Y' ) !== -1 ) {
          if ( alignVector.copy( unitY ).applyQuaternion( quaternion ).dot( this.eye ) < AXIS_FLIP_TRESHOLD ) {
            if ( handle.tag === 'fwd' ) {
              handle.visible = false;
            } else {
              handle.scale.y *= -1;
            }
          } else if ( handle.tag === 'bwd' ) {
            handle.visible = false;
          }
        }

        if ( handle.name.search( 'Z' ) !== -1 ) {
          if ( alignVector.copy( unitZ ).applyQuaternion( quaternion ).dot( this.eye ) < AXIS_FLIP_TRESHOLD ) {
            if ( handle.tag === 'fwd' ) {
              handle.visible = false;
            } else {
              handle.scale.z *= -1;
            }
          } else if ( handle.tag === 'bwd' ) {
            handle.visible = false;
          }
        }

      } else if ( this.mode === 'rotate' ) {

        // Align handles to current local or world rotation

        tempQuaternion2.copy( quaternion );
        alignVector.copy( this.eye ).applyQuaternion( tempQuaternion.copy( quaternion ).inverse() );

        if ( handle.name.search( "E" ) !== - 1 ) {

          handle.quaternion.setFromRotationMatrix( lookAtMatrix.lookAt( this.eye, zeroVector, unitY ) );

        }

        if ( handle.name === 'X' ) {

          tempQuaternion.setFromAxisAngle( unitX, Math.atan2( -alignVector.y, alignVector.z ) );
          tempQuaternion.multiplyQuaternions( tempQuaternion2, tempQuaternion );
          handle.quaternion.copy( tempQuaternion );

        }

        if ( handle.name === 'Y' ) {

          tempQuaternion.setFromAxisAngle( unitY, Math.atan2( alignVector.x, alignVector.z ) );
          tempQuaternion.multiplyQuaternions( tempQuaternion2, tempQuaternion );
          handle.quaternion.copy( tempQuaternion );

        }

        if ( handle.name === 'Z' ) {

          tempQuaternion.setFromAxisAngle( unitZ, Math.atan2( alignVector.y, alignVector.x ) );
          tempQuaternion.multiplyQuaternions( tempQuaternion2, tempQuaternion );
          handle.quaternion.copy( tempQuaternion );

        }

      }

      // Hide disabled axes
      handle.visible = handle.visible && ( handle.name.indexOf( "X" ) === -1 || this.showX );
      handle.visible = handle.visible && ( handle.name.indexOf( "Y" ) === -1 || this.showY );
      handle.visible = handle.visible && ( handle.name.indexOf( "Z" ) === -1 || this.showZ );
      handle.visible = handle.visible && ( handle.name.indexOf( "E" ) === -1 || ( this.showX && this.showY && this.showZ ) );

      // highlight selected axis

      handle.material._opacity = handle.material._opacity || handle.material.opacity;
      handle.material._color = handle.material._color || handle.material.color.clone();

      handle.material.color.copy( handle.material._color );
      handle.material.opacity = handle.material._opacity;

      if ( !this.enabled ) {

        handle.material.opacity *= 0.5;
        handle.material.color.lerp( new THREE.Color( 1, 1, 1 ), 0.5 );

      } else if ( this.axis ) {

        if ( handle.name === this.axis ) {

          handle.material.opacity = 1.0;
          handle.material.color.lerp( new THREE.Color( 1, 1, 1 ), 0.5 );

        } else if ( this.axis.split('').some( function( a ) { return handle.name === a; } ) ) {

          handle.material.opacity = 1.0;
          handle.material.color.lerp( new THREE.Color( 1, 1, 1 ), 0.5 );

        } else {

          handle.material.opacity *= 0.25;
          handle.material.color.lerp( new THREE.Color( 1, 1, 1 ), 0.5 );

        }

      }

    }

    THREE.Object3D.prototype.updateMatrixWorld.call( this );

  };

};

THREE.TransformControlsGizmo.prototype = Object.assign( Object.create( THREE.Object3D.prototype ), {

  constructor: THREE.TransformControlsGizmo,

  isTransformControlsGizmo: true

} );


THREE.TransformControlsPlane = function () {

  'use strict';

  THREE.Mesh.call( this,
    new THREE.PlaneBufferGeometry( 100000, 100000, 2, 2 ),
    new THREE.MeshBasicMaterial( { visible: false, wireframe: true, side: THREE.DoubleSide, transparent: true, opacity: 0.1 } )
  );

  this.type = 'TransformControlsPlane';

  var unitX = new THREE.Vector3( 1, 0, 0 );
  var unitY = new THREE.Vector3( 0, 1, 0 );
  var unitZ = new THREE.Vector3( 0, 0, 1 );

  var tempVector = new THREE.Vector3();
  var dirVector = new THREE.Vector3();
  var alignVector = new THREE.Vector3();
  var tempMatrix = new THREE.Matrix4();
  var identityQuaternion = new THREE.Quaternion();

  this.updateMatrixWorld = function() {

    var space = this.space;

    this.position.copy( this.worldPosition );

    if ( this.mode === 'scale' ) space = 'local'; // scale always oriented to local rotation

    unitX.set( 1, 0, 0 ).applyQuaternion( space === "local" ? this.worldQuaternion : identityQuaternion );
    unitY.set( 0, 1, 0 ).applyQuaternion( space === "local" ? this.worldQuaternion : identityQuaternion );
    unitZ.set( 0, 0, 1 ).applyQuaternion( space === "local" ? this.worldQuaternion : identityQuaternion );

    // Align the plane for current transform mode, axis and space.

    alignVector.copy( unitY );

    switch ( this.mode ) {
      case 'translate':
      case 'scale':
        switch ( this.axis ) {
          case 'X':
            alignVector.copy( this.eye ).cross( unitX );
            dirVector.copy( unitX ).cross( alignVector );
            break;
          case 'Y':
            alignVector.copy( this.eye ).cross( unitY );
            dirVector.copy( unitY ).cross( alignVector );
            break;
          case 'Z':
            alignVector.copy( this.eye ).cross( unitZ );
            dirVector.copy( unitZ ).cross( alignVector );
            break;
          case 'XY':
            dirVector.copy( unitZ );
            break;
          case 'YZ':
            dirVector.copy( unitX );
            break;
          case 'XZ':
            alignVector.copy( unitZ );
            dirVector.copy( unitY );
            break;
          case 'XYZ':
          case 'E':
            dirVector.set( 0, 0, 0 );
            break;
        }
        break;
      case 'rotate':
      default:
        // special case for rotate
        dirVector.set( 0, 0, 0 );
    }

    if ( dirVector.length() === 0 ) {

      // If in rotate mode, make the plane parallel to camera
      this.quaternion.copy( this.cameraQuaternion );

    } else {

      tempMatrix.lookAt( tempVector.set( 0, 0, 0 ), dirVector, alignVector );

      this.quaternion.setFromRotationMatrix( tempMatrix );

    }

    THREE.Object3D.prototype.updateMatrixWorld.call( this );

  };

};

THREE.TransformControlsPlane.prototype = Object.assign( Object.create( THREE.Mesh.prototype ), {

  constructor: THREE.TransformControlsPlane,

  isTransformControlsPlane: true

} );
